Molding and casting reinforced brake-shoes.



D. RAWSTRO'N. 'MOLDING AND GASTING BEINFORGED BRAKE sHoEs.

V APPLIOATION FILED 00T. 5, 1909.

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DONALD RAWSTRON, 0F CHICAGO, ILLINOIS.

`MOLDING AND CASTING REINFORCED BRAKE-SHOES.

Specification of Letters Patent.

Application filed October 5, 1909.

Patented July 12, 1910.

Serial No. 521,108.

To all whom 'it may concern:

Be it known that I, DONALD RAwsTkoN, of the city of Chicago, State of Illinois, United States of America, have invented certain new and useful Improvements in Molding and Casting Reinforced Brake- Shoes, of which the following is a specification.

This invention relates to the molding and casting of brake shoes provided with tough metal reinforcing strips at the back and a separate tough metal hook-shaped attaching lug, and my obj ect is to devise a process of molding such shoes which will insure that the gape of the hook will always be exactly the same in every shoe cast.

I attain my object by adopting a particular arrangement of the hook and reinforcement and by following a process of moldingl which may be briefly described as follows: The lug is formed with shoulders on its shank engaging the underside of the reinforcement. A suitable shape of pattern is employed to form in the cope of the flask a recess for the reception of the lug and for a core which separates the jaw of the hook from the reinforcement. This core holds the hook up with its shoulders in contact with the reinforcement and accurately determinates the gape of the hook.

Figure 1 is a longitudinal section of a molding box or flask prepared ready for the casting of a brake shoe. Fig. 2 is a cross section of the Same adjacent to the attaching lug. Fig. 8 is a perspective detail illustrating the relative positions of the end of the brake shoe, the lug, the reinforcement and the core forming the gape of the lug. Fig. l is a perspective detail of the pattern used in molding the brake shoe. Fig. 5 is a plan view of the back of a brake shoe constructed in accordance with my invention.

In the drawings like letters of reference indicate corresponding parts in the different figures.

The brake shoe itself comprises a cast metal body A, the reinforcing strips lB of a tough or malleable metal, and the attach ing lug C, also of tough or malleable metal.

The reinforcement is construed substantially as shown and described in U. S. Patof course, other forms of reinforcement at the back of the shoe might be employed for the purpose of the present invention.

The attaching lug C is hook-shaped being provided with the jaw D extending toward the middle of the shoe substantially parallel to the back. I form the lug C with the shoulders a which engage the undersides of the reinforcement B. This contact determines the maximum gap of the lug or hook.

In order to insure the gape being the same in every brake shoe cast I have devised the process hereinbefore partly described and which I will now set out in detail.

A pat-tern is formed substantially as shown in Fig. 4., E forming the body of the shoe and F forming the recess for the reception of the attaching lug and a core used in settling the gape of the lug.

In Figs. 1 and 2 I show the molding box or flask, G being the cope and II the drag. The shoe is molded in the flask, the back being molded in the cope of the flask. After the impression has been taken from the pattern, the cope is turned over and the lug C placed in the print ready to receive it. As already stated, the part F of the pattern forms the print for the projecting part of the lug and for the core I. This core is separately formed and placed in position as indicated in Figs. 1.*2 and 3 between the jaw D of the lug and the reinforcement which is in contact with the shoulders a. The reinforcement may be secured to the cope by nails in the ordinary manner and the parts of the flask placed together, as shown in Figs. 1 and 2.

It is evident that the core I insures that in every brake shoe cast the jaw of the lug will be separated from the back of the shoe by a space having exactly the same depth in every shoe, consequently when the shoes have been cast in molds prepared as just described all the lugs will be exactly the same in their gap, and the trouble now frequently experienced with ill fitting lugs will be entirely avoided.

What I claim as my invention is A process of securing an attaching lug in a cast metal brake shoe provided with a reinforcement at its back, which consists in forming the lug with a shoulder adapted to engage the underside of the reinforcemold to hold the shoulder on the lug in com ment, molding' the shoe and forming :i print tact Withthe underside of the reinforcement. 10 for the external part of the lug and for a Chicago, Iliinois, this 27 day of Septemcore to separate the jaw of the lug from the ber 1909.

reinforcement, placing the lug and rein- DONALD RAVSTRON. forcement 1n posltlon and then pouring' the Signed in the presence 0f mold 1n the ordinary manner7 forming a HERMAN F. BUNDE7 core and inserting it in the print in the; EUGENE C. HERMESTROFF. 

